In addition to the Department of Defense, the Treasury Department, Secret Service, Federal Trade Commission and Transportation Department Web sites were also under attack last week and were down at certain points. It was just back in December that DOD has a virus throughout the system 
which appeared to have landed there due to using a USB flash drive.
Malware attack - Department of Defense
Denial of Service attacks occur when the server is flooded with requests and basically jams the system so nobody can get through to the site and now a software reporting solution is being sought for administrators to be alerted as to when an attack occurs. BD
The Defense Information Systems Agency wants commercial products that could help network administrators detect and react to distributed-denial-of-service (DDOS) attacks, according to a request for information posted today.
“The goal of this solution is to detect and mitigate all DDOS attempts to disrupt [Defense Department] network communications and to detect internal assets displaying anomalous behavior across the Internet-to-NIPRnet boundary,” the notice states.
Last week, hackers used that type of attack on government and private-sector Web sites in the United States and South Korea to varying degrees of success.
According to a report in the Wall Street Journal last week, DOD officials confirmed that their networks had been struck. But the officials said the intrusions were detected quickly and did no real damage. Other U.S. government Web sites reportedly didn’t fare as well.
DOD seeks defense against denial-of-service attacks -- Federal Computer Week
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